Manual port closing tool for well cementing

Abstract

In a downhole staging apparatus for delivering fluidized cement sequentially into two levels of substrate which enclose a wellbore casing. Said apparatus comprises a primary cement discharge port, and one or more secondary or lateral cement discharge ports. A sleeve is operably carried in the apparatus, being adjustable to close the secondary lateral port when a cementing operation is completed. A sleeve actuating tool is cooperative with said cementing apparatus, being remotely operable to close the lateral cement discharge port to assure that no communication exists between the cementing apparatus and the wellbore after the cementing operation is completed.

We claim: 
     
       1. In a stage collar for a cased well cementing operation, in which fluidized cement is conducted through the stage collar and deposited into the surrounding substrate to form a well casing sheath, said stage collar including: a shell defining an elongated chamber,   means forming inlet and outlet cement flow openings at opposed ends of said elongated chamber,   at least one secondary discharge port in said casing communicated with said elongated chamber,   a flow control sleeve operably positioned in said shell to regulate cement flow through said cement discharge ports, said sleeve comprising:   a first sleeve segment having a first internal annular shoulder which defines a primary cement discharge port at said shell outlet opening, said first sleeve moveable to open said secondary discharge port   a second sleeve segment having a second internal annular shoulder which defines an inlet port for directing said cement flow into said elongated chamber, said second sleeve movable to close said secondary discharge port the combination with:   an elongated actuating tool which is operable to position said second sleeve segment with respect to said secondary discharge port, which actuating tool comprises   a body adapted for transversing said elongated chamber and including:   a cutter depending from said body, being of a sufficient diameter to cut away at least a portion of the said first internal shoulder,   an annular seat depending outwardly from said body a sufficient distance to engage said second internal annular shoulder, whereby to urge the second sleeve segment into closing engagement with said secondary discharge port, and   means for operably coupling said body to a rotatable support member.   
     
     
       2. In the apparatus as defined in claim 1, wherein said support member is comprised of a rigid drive shaft. 
     
     
       3. In the apparatus as defined in claim 2, wherein said rigid drive shaft includes at least one stabilizer member depending therefrom to contact said casing inner wall whereby to axially align said elongated actuating tool with said elongated chamber. 
     
     
       4. In the apparatus as defined in claim 2, wherein said rigid drive shaft includes means for progressing said actuating tool through said casing. 
     
     
       5. In the apparatus as defined in claim 1, wherein said first and second sleeve segments are operable to overlap corresponding portions of each other.